scholarly journals Evaluation of resilient behavior of a clayey soil with polyethylene terephthalate (PET) insertion for application in pavements base

2019 ◽  
Vol 92 ◽  
pp. 12006
Author(s):  
Bárbara Carvalho ◽  
Michéle Casagrande ◽  
Márcio Farias
Keyword(s):  
Environmental Problem ◽  
Clayey Soil ◽  
Resilient Modulus ◽  
Triaxial Tests ◽  
Cyclic Triaxial Tests ◽  
Pet Bottles ◽  
Production And Consumption ◽  
Alternative Material ◽  
Physical Tests ◽  
Empirical Design

The growing production and consumption of PET bottles represent a major environmental problem because they end up being improperly discarded in nature or simply stocked. With the aim to attenuate the environmental problem caused by this residue, this research proposes the use of PET flakes as an alternative material for pavements base. In order to analyze the geotechnical performance of the material, physical tests, compaction and Cyclic Triaxial tests (Resilient Modulus) were carried out on pure soil as well as on the mixture of soil and PET flakes in weight percentages of 3, 5 and 7 %. The computer program SisPav (Franco, 2007) was used to perform a mechanistic-empirical design for a typical pavement structure with parameters obtained for the mixtures. The results indicated that the insertion of PET influences the mechanical behavior of the soil. It was found that resilient modulus increases, with respect to that of pure soil, for mixtures with the lowest content of PET (3%). For tests with higher contents of PET flakes, the Resilient Modulus decreases. This research concluded that the clayey soil mixed with PET flakes can be used as an alternative material for pavements base, as long as a low content of flakes is used.

scholarly journals A Methodology for Determination of Resilient Modulus of Asphaltic Concrete

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
A. Patel ◽  
M. P. Kulkarni ◽  
S. D. Gumaste ◽  
P. P. Bartake ◽  
K. V. K. Rao ◽  
...  
Keyword(s):  
Resilient Modulus ◽  
Triaxial Tests ◽  
Asphaltic Concrete ◽  
Empirical Relationships ◽  
Cyclic Triaxial Tests ◽  
Electronic Circuitry ◽  
Quality Check ◽  
R Value ◽  
Vast Variation

Resilient modulus, , is an important parameter for designing pavements. However, its determination by resorting to cyclic triaxial tests is tedious and time consuming. Moreover, empirical relationships, correlating to various other material properties (namely, California Bearing Ratio, CBR; Limerock Bearing Ratio, LBR; R-value and the Soil Support Value, SSV), give vast variation in the estimated results. With this in view, an electronic circuitry, which employs bender and extender elements (i.e., piezo-ceramic elements), was developed. Details of the circuitry and the testing methodology adopted for this purpose are presented in this paper. This methodology helps in determining the resilient modulus of the material quite precisely. Further, it is believed that this methodology would be quite useful to engineers and technologists for conducting quality check of the pavements, quite rapidly and easily.

scholarly journals An Evaluation of the Resilient Modulus and Permanent Deformation of Unbound Mixtures of Granular Materials and Rubber Particles from Scrap Tyres to Be Used in Subballast Layers

2016 ◽  
Author(s):  
Carlos Hidalgo Sgnes
Keyword(s):  
Granular Materials ◽  
Resilient Modulus ◽  
Permanent Deformation ◽  
Waste Material ◽  
Triaxial Tests ◽  
Rubber Content ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Vibration Attenuation ◽  
Rubber Particles

Over the last years rubber from scrap tyres has been reused in different civil works such as road embankments and railway platforms due to its resilient properties, low degradation and vibration attenuation. Unfortunately, this issue is still scarce. For instance, in Spain about 175.000 tonnes of scrap tyres were collected in 2014, of which only 0.6% were reused in civil works. Aiming to contribute to the reutilisation of large quantities of this waste material, this paper focuses on the analysis of unbound mixtures of granular materials with different percentages of rubber particles to be used as subballast layers. Mixtures are tested under cyclic triaxial tests so as to obtain their resilient modulus and evaluate their permanent deformations. It is found that as the rubber content increases, the resilient modulus decreases and the permanent deformation increases. Taking into account the usual loads transmitted to the subballast layer, the optimum rubber content that does not compromise the behaviour of the mixture is set in a range between 2.5% and 5% in terms of weight.DOI: http://dx.doi.org/10.4995/CIT2016.2016.4231

Resilient Moduli of Treated Clays from Repeated Load Triaxial Test

2003 ◽  
Vol 1821 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Anand J. Puppala ◽  
Aravinda M. Ramakrishna ◽  
Laureano R. Hoyos
Keyword(s):  
Clayey Soil ◽  
Resilient Modulus ◽  
Triaxial Tests ◽  
Cement Type ◽  
Repeated Load ◽  
Resilient Response ◽  
Type V ◽  
Deviatoric Stresses ◽  
The Impact ◽  
Repeated Load Triaxial

Three chemical stabilization methods—sulfate resistant cement (Type V), low-calcium fly-ash (Class F) mixed with sulfate resistant cement (Type V), and ground granulated blast furnace slag—were used in a series of repeated load triaxial tests on clayey soil to assess the effectiveness of these three stabilizers in enhancing resilient modulus ( MR) properties of the soil. MR results were measured from repeated load triaxial tests conducted on both control and treated soils at optimum moisture content levels. Test results were analyzed to understand the potentials of each stabilizer on MR response of the soils and to study the effects of confining and deviatoric stresses on resilient response of the treated soils. Mechanisms for MR enhancements in treated soils were developed, and a series of flexible pavement design exercises was conducted to evaluate the impact of each stabilizer on the design thickness of the asphalt surface layer of pavements.

scholarly journals Desenvolvimento de um equipamento de grandes dimensões para análise de estruturas de pavimentos

TRANSPORTES ◽  
2010 ◽  
Vol 18 (2) ◽  
Author(s):  
Francis Massashi Kakuda ◽  
Alexandre Benetti Parreira ◽  
Glauco Túlio Pessa Fabbri
Keyword(s):  
Large Scale ◽  
Resilient Modulus ◽  
Triaxial Tests ◽  
Soil Pressure ◽  
Cyclic Triaxial Tests ◽  
Pressure Transducers ◽  
Load Cells ◽  
Pavement Structures ◽  
Good Operation

<p><strong>Resumo: </strong>O artigo apresenta o desenvolvimento, a montagem e um exemplo de aplicação de um equipamento de grande porte (seção de 1,5 x 1,5m e altura de 1,2m) para o ensaio em laboratório de estruturas de pavimentos com materiais, espessuras de camadas e condições de carregamento similares às de campo. O carregamento cíclico é aplicado por um cilindro pneumático alimentado por um compressor de ar. A instrumentação é constituída de LVDTs, células de carga e de tensão total que permitem o monitoramento das cargas aplicadas, tensões no interior das camadas e deslocamentos elásticos e permanentes na superfície do pavimento. Com as bacias de deflexões determinadas a partir dos deslocamentos elásticos superficiais, é possível, por meio de retroanálise, o cálculo dos módulos de resiliência dos materiais constituintes das camadas ensaiadas. Os ensaios realizados até o presente indicam que o equipamento apresenta bom funcionamento, sendo que o sistema pneumático atende às expectativas, os transdutores fornecem medidas com a precisão exigida e os valores de módulo de resiliência calculados por meio da retroanálise são compatíveis com os determinados em ensaios triaxiais cíclicos e com os observados em campo em condições similares.</p><p><strong>Abstract: </strong>The article presents the development, the assembly and an example of application of large-scale equipment (width of 1.5*1.5m and height of 1.2m) for testing pavement structures in laboratory, with materials, layers thicknesses and loading conditions similar to the field ones. The load is cyclic and generated from a pneumatic actuator. The instrumentation is constituted of LVDTs, load-cells and soil pressure transducers that permit monitoring the applied loads and the stress distribution in the interior of the layers, as well as plastic and elastic deformations on the pavement surface. From the deflection basin obtained, it is possible, by means of backcalculation, the determination of the materials resilient modulus. In a preliminary analysis, the equipment showed a good operation, attended to the expectations and the transducers supplied measures with the required precision. The backcalculation results were compatible with those obtained from cyclic triaxial tests and those observed in similar field conditions.</p>

Effect of the loading frequency on the sand liquefaction behaviour in cyclic triaxial tests

2021 ◽  
Vol 147 ◽  
pp. 106779
Author(s):  
Zhehao Zhu ◽  
Feng Zhang ◽  
Qingyun Peng ◽  
Jean-Claude Dupla ◽  
Jean Canou ◽  
...  
Keyword(s):  
Triaxial Tests ◽  
Loading Frequency ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Sand Liquefaction

scholarly journals Resilient modulus and cumulative plastic strain of frozen silty clay under dynamic aircraft loading

2021 ◽  
Vol 3 (10) ◽  
Author(s):  
Xiaolan Liu ◽  
Xianmin Zhang ◽  
Xiaojiang Wang
Keyword(s):  
Plastic Strain ◽  
Resilient Modulus ◽  
Confining Pressure ◽  
Frozen Soil ◽  
Triaxial Tests ◽  
Silty Clay ◽  
Research Findings ◽  
Cumulative Plastic Strain ◽  
Construction Operation ◽  
Compaction Degree

AbstractThis paper describes an investigation into the factors influencing the resilient modulus and cumulative plastic strain of frozen silty clay. A series of dynamic triaxial tests are conducted to analyze the influence of the temperature, confining pressure, frequency, and compaction degree on the resilient modulus and cumulative plastic strain of frozen silty clay samples. The results show that when the temperature is below − 5 °C, the resilient modulus decreases linearly, whereas when the temperature is above − 5 °C, the resilient modulus decreases according to a power function. The resilient modulus increases logarithmically when the frequency is less than 2 Hz and increases linearly once the frequency exceeds 2 Hz. The resilient modulus increases as the confining pressure and compaction degree increase. The cumulative plastic strain decreases as the temperature decreases and as the confining pressure, frequency, and compaction degree increase. The research findings provide valuable information for the design, construction, operation, maintenance, safety, and management of airport engineering in frozen soil regions.

Importance of Measuring Local Strains in Cyclic Triaxial Tests on Granular Materials

2009 ◽  
pp. 288-288-15 ◽  
Author(s):  
F Tatsuoka ◽  
S Teachavorasinskun ◽  
J Dong ◽  
Y Kohata ◽  
T Sato
Keyword(s):  
Granular Materials ◽  
Triaxial Tests ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Local Strains
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